Canada beat the U.S. for the 39th time in 43 games in World Hockey Championship history, 5-1 in the biggest rout between the two rivals since 1997 in their Worlds opener in St. Petersburg, Russia, on Friday.
NHL players Brad Marchand, Taylor Hall, Matt Duchene, Brendan Gallagher and Boone Jenner scored for Canada, which came back from a 1-0 deficit.
The U.S. had New Jersey Devils backup Keith Kincaid in goal. Canada started Edmonton Oilers No. 1 Cam Talbot, who allowed a first-period goal to Patrick Maroon.
The U.S., bronze-medal winner in 2013 and 2015, and reigning World champion Canada are in the same eight-team group at Worlds.
The top four teams in each group advance to the quarterfinals that begin May 19.
The U.S. next plays Belarus on Saturday on NBC Sports Live Extra at 1 p.m. ET. Full NBC Sports broadcast coverage information of Worlds is here.